implementation.cs

ajax patterns 这是关于ajax设计模式方面的原代码

/*
    Copyright 2006 Christian Gross http://www.devspace.com
    From the book Ajax Patterns and Best Practices

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
using System;
using System.Web;
using System.IO;
using Devspace.Commons.Tracer;

namespace Devspace.Ajax.StateNavigation {
    [Serializable]
    public class StateNavigationHashFilter : NavigationBase< StateNavigationHashFilter.Data> {
        public  class Data {
            public String _method;
            public String _stateHeader;
            public int _operation;
            public String _path;
            public void reset() {
                _method = null;
                _stateHeader = null;
                _operation = OP_NONE;
                _path = null;
            }
            public override string ToString() {
                return "_method (" + _method + ") _stateHeader (" + _stateHeader +
                    ") _operation (" + _operation + ") _path (" + _path + ")";
            }
        }
        
        private const int OP_NONE = 0;
        private const int OP_RETRIEVE = 1;
        private const int OP_POST = 2;
        
        public override Data InitializeRequest() {
            return new Data();
        }
        public override void DestroyRequest( Data objData) {
            
        }
        
        public override bool IsTrigger( Data data, HttpRequest httprequest, HttpResponse httpresponse) {
            String tail = httprequest.Path.Substring(
                httprequest.Path.Length - _URLStateIdentifierLength);
            GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "Checking if path (" + httprequest.Path +
                                 ") ending (" + tail + ") has (" + _URLStateIdentifier + ")");
            String stateHeader = httprequest.Headers.Get( _XPageState);
            GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "Getting the Page State Identifier eg #10->10 (" + stateHeader + ")");
            
            if (tail.CompareTo(_URLStateIdentifier) == 0) {
                data._path = httprequest.Path.Substring(0, httprequest.Path.Length - _URLStateIdentifierLength);
            }
            else {
                if (stateHeader == null) {
                    return false;
                }
                data._path = httprequest.Path;
            }
            
            data._method = httprequest.HttpMethod;
            data._stateHeader = stateHeader;
            data._operation = OP_NONE;
            GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "data.ToString (" + data.ToString() + ")");
            if (data._method.CompareTo("GET") == 0) {
                GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "This is a retrieval HTTP GET");
                data._operation = OP_RETRIEVE;
                return true;
            }
            else if (data._method.CompareTo("PUT") == 0 || data._method.CompareTo("POST") == 0) {
                GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "This is a retrieval HTTP POST");
                data._operation = OP_POST;
                return true;
            }
            data.reset();
            return false;
        }
        public override void RunFilter( Data data, HttpRequest httprequest, HttpResponse httpresponse)  {
            GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Running the filter");
            if (data._operation == OP_RETRIEVE) {
                GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Doing a retrieval");
                State state;
                if (data._stateHeader == null || data._stateHeader.CompareTo("none") == 0) {
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "There is no state so get an empty state");
                    state = _stateManager.GetEmptyState();
                }
                else {
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "There is a state so retrieve it from the state manager");
                    state = _stateManager.CopyState(data._stateHeader);
                }
                httpresponse.ContentType = _resourceStateContentType;
                httpresponse.AddHeader(_XPageState, state.StateIdentifier);
                httpresponse.StatusCode = 200;
                httpresponse.Output.Write( state.Buffer);
                return;
            }
            else if (data._operation == OP_POST) {
                GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Doing a posting");
                Stream inpStream = httprequest.InputStream;
                byte[] toReadBuffer = new byte[inpStream.Length];
                if (inpStream.Read(toReadBuffer, 0, toReadBuffer.Length) > 0) {
                    string buffer = System.Text.Encoding.ASCII.GetString( toReadBuffer);
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Read state is (" + buffer + ")");
                    State state = _stateManager.GetState(data._stateHeader);
                    state.URL = data._path;
                    state.Buffer = System.Text.Encoding.ASCII.GetString( toReadBuffer);
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Save state buffer is (" + state.ToString() + ")");
                    httpresponse.AddHeader( _XPageState, state.StateIdentifier);
                    httpresponse.StatusCode = 200;
                }
                return;
            }
        }
        
        public void destroy() {
        }
    }
    [Serializable]
    public class StateNavigationWindowNameFilter : NavigationBase< StateNavigationWindowNameFilter.Data> {
        public  class Data {
            public String _method;
            public String _stateHeader;
            public String _windowName;
            public int _operation;
            public String _path;
            public void reset() {
                _method = null;
                _stateHeader = null;
                _operation = OP_NONE;
                _path = null;
                _windowName = null;
            }
            public override string ToString() {
                return "_method (" + _method + ") _stateHeader (" + _stateHeader +
                    ") _windowName (" + _windowName + ") _operation (" + _operation +
                    ") _path (" + _path + ")";
            }
        }
        
        private const int OP_NONE = 0;
        private const int OP_RETRIEVE = 1;
        private const int OP_POST = 2;
        
        public override Data InitializeRequest() {
            return new Data();
        }
        public override void DestroyRequest( Data objData) {
            
        }
        
        public override bool IsTrigger( Data data, HttpRequest httprequest, HttpResponse httpresponse) {
            String tail = httprequest.Path.Substring(
                httprequest.Path.Length - _URLStateIdentifierLength);
            GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "Checking if path (" + httprequest.Path +
                                 ") ending (" + tail + ") has (" + _URLStateIdentifier + ")");
            String stateHeader = httprequest.Headers.Get( _XPageState);
            GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "Getting the Page State Identifier eg #10->10 (" + stateHeader + ")");
            
            if (tail.CompareTo(_URLStateIdentifier) == 0) {
                data._path = httprequest.Path.Substring(0, httprequest.Path.Length - _URLStateIdentifierLength);
            }
            else {
                if (stateHeader == null) {
                    return false;
                }
                data._path = httprequest.Path;
            }
            
            data._method = httprequest.HttpMethod;
            data._stateHeader = stateHeader;
            data._operation = OP_NONE;
            data._windowName = httprequest.Headers.Get(_XPageWindowName);
            GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "data.ToString (" + data.ToString() + ")");
            if (data._method.CompareTo("GET") == 0) {
                GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "This is a retrieval HTTP GET");
                data._operation = OP_RETRIEVE;
                return true;
            }
            else if (data._method.CompareTo("PUT") == 0 || data._method.CompareTo("POST") == 0) {
                GenerateOutput.Write( "StateNavigationFilter.IsTrigger", "This is a retrieval HTTP POST");
                data._operation = OP_POST;
                return true;
            }
            data.reset();
            return false;
        }
        public override void RunFilter( Data data, HttpRequest httprequest, HttpResponse httpresponse)  {
            GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Running the filter");
            if (data._operation == OP_RETRIEVE) {
                GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Doing a retrieval");
                State state;
                if (data._stateHeader == null || data._stateHeader.CompareTo("none") == 0) {
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "There is no state so get an empty state");
                    state = _stateManager.GetEmptyState(data._path, data._windowName);
                }
                else {
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "There is a state so retrieve it from the state manager");
                    state = _stateManager.CopyState(data._stateHeader, data._path, data._windowName);
                }
                httpresponse.ContentType = _resourceStateContentType;
                httpresponse.AddHeader(_XPageState, state.StateIdentifier);
                httpresponse.StatusCode = 200;
                httpresponse.Output.Write( state.Buffer);
                return;
            }
            else if (data._operation == OP_POST) {
                GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Doing a posting");
                Stream inpStream = httprequest.InputStream;
                byte[] toReadBuffer = new byte[inpStream.Length];
                if (inpStream.Read(toReadBuffer, 0, toReadBuffer.Length) > 0) {
                    string buffer = System.Text.Encoding.ASCII.GetString( toReadBuffer);
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Read state is (" + buffer + ")");
                    State state = _stateManager.GetState(data._stateHeader);
                    state.URL = data._path;
                    state.WindowName = data._windowName;
                    state.Buffer = System.Text.Encoding.ASCII.GetString( toReadBuffer);
                    GenerateOutput.Write( "StateNavigationFilter.RunFilter", "Save state buffer is (" + state.ToString() + ")");
                    httpresponse.AddHeader( _XPageState, state.StateIdentifier);
                    httpresponse.StatusCode = 200;
                }
                return;
            }
        }
        
        public void destroy() {
        }
    }
}